#include <sys/types.h>  
#include <sys/socket.h>  
#include <netinet/in.h>  
#include <arpa/inet.h>  
#include <time.h>  
#include <string.h>  
#include <stdio.h>  
#include <unistd.h>  
#include <stdlib.h>  
#define HELLO_PORT 12345  
#define HELLO_GROUP "225.0.0.37"  
int main(int argc, char *argv[])  
{  
    struct sockaddr_in addr;  
    int fd, cnt;  
    struct ip_mreq mreq;  
    char const *message="Hello, World!\n";  
    /* create what looks like an ordinary UDP socket */  
    if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0)   
    {  
        perror("socket");  
        exit(1);  
    }  
    /* set up destination address */  
    bzero(&addr, sizeof(addr));  
    addr.sin_family=AF_INET;  
    addr.sin_addr.s_addr=inet_addr(HELLO_GROUP);  
    addr.sin_port=htons(HELLO_PORT);  
    /* now just sendto() our destination! */  
    while (1)  
    {  
        if (sendto(fd,message, strlen(message), 0, (struct sockaddr *) &addr, sizeof(addr)) < 0)   
        {  
            perror("sendto");  
            exit(1);  
        }  
        sleep(1);  
    }  
    return 0;  
}
